CN207817160U - The current signal conditioning circuit and current sensing means of intelligent electric machine on-line checking - Google Patents
The current signal conditioning circuit and current sensing means of intelligent electric machine on-line checking Download PDFInfo
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- CN207817160U CN207817160U CN201820153123.2U CN201820153123U CN207817160U CN 207817160 U CN207817160 U CN 207817160U CN 201820153123 U CN201820153123 U CN 201820153123U CN 207817160 U CN207817160 U CN 207817160U
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Abstract
The utility model provides a kind of current signal conditioning circuit and current sensing means of intelligent electric machine on-line checking, which includes the signal adjustment channel corresponding to each phase current signal of three-phase ac signal；Each signal adjustment channel includes current transformer, adjustment capacitance, differential voltage circuit and filter circuit；Current transformer acquisition frequency converter is output to the input current of motor, is sampled the input current to obtain sample rate current；It is in parallel with current transformer to adjust capacitance, carrying out High frequency filter to sample rate current obtains filtered current signal；Differential voltage circuit and adjustment capacitance connection, differential voltage signal is converted to by filtered current signal；Filter circuit is connect with differential voltage circuit, and carrying out bidirectional filtering to differential voltage signal obtains analog signals.The input current that frequency converter is output to motor can be directly acquired in this way, filtered out high fdrequency component during adjustment and reduced signal interference so that the metering of subsequent current is more acurrate.
Description
Technical field
The utility model is related to electric machines test technical fields, believe more particularly, to a kind of electric current of intelligent electric machine on-line checking
Number modulate circuit and current sensing means.
Background technology
Motor is a kind of electrical equipment for converting electrical current into mechanical energy, and in the industrial production, motor is widely used
It is general, in the whole society in power consumption, there is 70% or so consuming in industrial circle, and the power consumption of industrial motor occupies entire work
The 70% of industry field electricity consumption.Due to motor occur failure, cause generate economic loss it is also very huge, the maintenance of motor and
Maintenance is all industrial important topic all the time.
Electric machines test can be carried out under normal conditions, to ensure the normal operation of motor, to avoid failure from causing
Heavy economic losses.And in electric machines test, in order to obtain the operating state data of motor, need to carry out current signal tune
Reason.For the electric current of motor inverter output, existing current signal conditioning circuit cannot directly acquire the electric current, and due to letter
Number interference is larger, causes the metering of subsequent current inaccurate.
Utility model content
In view of this, the purpose of this utility model is to provide a kind of current signal of intelligent electric machine on-line checking conditioning electricity
Road and current sensing means filter out high fdrequency component and reduce directly to acquire the output current of motor inverter during adjustment
Signal interference so that the metering of subsequent current is more acurrate.
In a first aspect, the utility model embodiment provides a kind of current signal conditioning electricity of intelligent electric machine on-line checking
Road includes the signal adjustment channel corresponding to each phase current signal of three-phase ac signal；Each signal adjusts channel
Include current transformer, adjustment capacitance, differential voltage circuit and filter circuit；
The wherein described current transformer is for acquiring the input current of motor to obtain sample rate current；
The adjustment capacitance is in parallel with the current transformer, for carrying out High frequency filter to the sample rate current, obtains
Filtered current signal；
The differential voltage circuit and the adjustment capacitance connection, for the filtered current signal to be converted to differential electrical
Press signal；
The filter circuit is connect with the differential voltage circuit, for carrying out two-way filter to the differential voltage signal
Wave obtains analog signals.
With reference to first aspect, the utility model embodiment provides the first possible embodiment of first aspect,
In, further include electrostatic discharge protective circuit, the electrostatic discharge protective circuit is connect with the filter circuit.
The possible embodiment of with reference to first aspect the first, the utility model embodiment provide the of first aspect
Two kinds of possible embodiments, wherein the differential voltage circuit includes the first differential resistor and the second differential resistor；
The first end of first differential resistor connects the first end of the adjustment capacitance；The of second differential resistor
One end connects the second end of the adjustment capacitance；The second of the second end of first differential resistor and second differential resistor
End is grounded.
The possible embodiment of with reference to first aspect the first, the utility model embodiment provide the of first aspect
Three kinds of possible embodiments, wherein the filter circuit includes two stage filter circuit.
The possible embodiment of with reference to first aspect the first, the utility model embodiment provide the of first aspect
Four kinds of possible embodiments, wherein the filter circuit includes RLC filter circuits and RC filter circuits；
The input terminal of the RLC filter circuits is connect with the differential voltage circuit, the output end of the RLC filter circuits
It is connect with the input terminal of the RC filter circuits, the output end of the RC filter circuits exports the analog signals.
The 4th kind of possible embodiment with reference to first aspect, the utility model embodiment provide the of first aspect
Five kinds of possible embodiments, wherein the RLC filter circuits include the first filter inductance, the first filter resistance, the first filtering
Capacitance, the second filter inductance, the second filter resistance and the second filter capacitor；
Described in the first end of first filter inductance and the first end of second filter inductance are connected as input terminal
Differential voltage circuit；The second end of first filter inductance connects the first end of first filter resistance；First filter
The second end of wave resistance connects the first end of first filter capacitor；The second end connection described the of second filter inductance
The first end of two filter resistances；The second end of second filter resistance connects the first end of second filter capacitor；It is described
The second end of first filter capacitor and the second end of second filter capacitor are grounded.
The 5th kind of possible embodiment with reference to first aspect, the utility model embodiment provide the of first aspect
Six kinds of possible embodiments, wherein the RC filter circuits include third filter resistance, third filter capacitor, the 4th filtering
Resistance and the 4th filter capacitor；
The first end of the third filter resistance connects the second end of first filter resistance；The third filter resistance
Second end connect the first end of the third filter capacitor；First end connection second filtering of 4th filter resistance
The second end of resistance；The second end of the third filter capacitor and the second end of the 4th filter capacitor are grounded.
The 6th kind of possible embodiment with reference to first aspect, the utility model embodiment provide the of first aspect
Seven kinds of possible embodiments, wherein the electrostatic discharge protective circuit includes the first diode and the second diode；
The cathode of first diode connects the first end of the third filter capacitor；The anode of first diode
Connect the cathode of second diode；The anode of second diode connects the first end of the 4th filter capacitor.
With reference to first aspect, the utility model embodiment provides the 8th kind of possible embodiment of first aspect,
In, the no-load voltage ratio of the current transformer is 2000:1.
Second aspect, the utility model embodiment also provide a kind of current sensing means, including electricity calculator, master control borad
With the current signal conditioning circuit as described in first aspect and its any possible embodiment；
The current signal conditioning circuit is connect with the electricity calculator；The electricity calculator also with the master control borad
Connection.
The utility model embodiment brings following advantageous effect：
In the embodiments of the present invention, the current signal conditioning circuit of the intelligent electric machine on-line checking includes corresponding to
The signal of each phase current signal of three-phase ac signal adjusts channel；Each signal adjustment channel include current transformer,
Adjust capacitance, differential voltage circuit and filter circuit；Wherein current transformer is adopted for acquiring the input current of motor with obtaining
Sample electric current；It is in parallel with current transformer to adjust capacitance, for carrying out High frequency filter to sample rate current, obtains filtered current signal；
Differential voltage circuit and adjustment capacitance connection, for filtered current signal to be converted to differential voltage signal；Filter circuit with it is poor
Voltage division circuit connects, and for carrying out bidirectional filtering to differential voltage signal, obtains analog signals.The utility model embodiment
The technical solution of offer acquires the input current that frequency converter is output to motor by current transformer, is carried out to the input current
Sampling filters out high fdrequency component therein by adjusting capacitance, filtered circuit is then changed into differential electrical to obtain sample rate current
Signal is pressed, to carry out bidirectional filtering, and then the noise jamming in current loop is filtered out, finally obtains analog signals.Therefore,
The utility model embodiment can directly acquire the input current that frequency converter is output to motor, and high frequency division has been filtered out during adjustment
It measures and reduces signal interference so that the metering of subsequent current is more acurrate.
Other feature and advantage of the utility model will illustrate in the following description, also, partly from specification
In become apparent, or understood by implementing the utility model.The purpose of this utility model and other advantages are illustrating
Specifically noted structure is realized and is obtained in book, claims and attached drawing.
To enable the above objects, features, and advantages of the utility model to be clearer and more comprehensible, preferred embodiment cited below particularly, and
The appended attached drawing of cooperation, is described in detail below.
Description of the drawings
It, below will be right in order to illustrate more clearly of specific embodiment of the present invention or technical solution in the prior art
Specific implementation mode or attached drawing needed to be used in the description of the prior art are briefly described, it should be apparent that, it is described below
In attached drawing be that some embodiments of the utility model are not paying creativeness for those of ordinary skill in the art
Under the premise of labour, other drawings may also be obtained based on these drawings.
Fig. 1 is the first of the current signal conditioning circuit for the intelligent electric machine on-line checking that the utility model embodiment provides
Structural schematic diagram；
Fig. 2 is second of the current signal conditioning circuit for the intelligent electric machine on-line checking that the utility model embodiment provides
Structural schematic diagram；
Fig. 3 is the circuit of the current signal conditioning circuit for the intelligent electric machine on-line checking that the utility model embodiment provides
Figure；
Fig. 4 is the structural schematic diagram for the current sensing means that the utility model embodiment provides.
Icon：
100- current transformers；200- adjusts capacitance；300- differential voltage circuits；400- filter circuits；410-RLC is filtered
Circuit；420-RC filter circuits；500- electrostatic discharge protective circuits；50- electricity calculators；60- master control borads；70- intelligent electric machines are online
The current signal conditioning circuit of detection.
Specific implementation mode
To keep the purpose, technical scheme and advantage of the utility model embodiment clearer, below in conjunction with attached drawing to this
The technical solution of utility model is clearly and completely described, it is clear that described embodiment is that the utility model part is real
Example is applied, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making
The every other embodiment obtained under the premise of creative work, shall fall within the protection scope of the present invention.
The electric current of motor is output to for frequency converter at present, existing current signal conditioning circuit cannot directly acquire the electricity
Stream, and since signal interference is larger, cause the metering of subsequent current inaccurate.Based on this, the utility model embodiment provide
A kind of current signal conditioning circuit and current sensing means of intelligent electric machine on-line checking, frequency converter is acquired by current transformer
It is output to the input current of motor, which is sampled to obtain sample rate current, is filtered out wherein by adjusting capacitance
High fdrequency component, filtered circuit is then changed into differential voltage signal, to carry out bidirectional filtering, and then filters out current loop
In noise jamming, finally obtain analog signals.It is done in this way, having filtered out high fdrequency component during the adjustment and having reduced signal
It disturbs so that the metering of subsequent current is more acurrate.
Technical solution provided by the utility model can be applied in the current acquisition of motor, detection process, pass through correlation
Hardware circuit is realized.For ease of understanding the present embodiment, first to a kind of intelligence disclosed in the utility model embodiment
The current signal conditioning circuit of motor on-line checking describes in detail.
Embodiment one：
Fig. 1 shows the of the current signal conditioning circuit for the intelligent electric machine on-line checking that the utility model embodiment provides
A kind of structural schematic diagram.As shown in Figure 1, since the current signal inputted in motor is three-phase ac signal, the intelligence electricity
The current signal conditioning circuit of machine on-line checking includes the signal adjustment corresponding to each phase current signal of three-phase ac signal
Channel.Each signal adjustment channel includes current transformer 100, adjustment capacitance 200, differential voltage circuit 300 and filtered electrical
Road 400.Assuming that signal adjustment channel includes corresponding to the A phase signals adjustment channel of each phase current signal, the adjustment of B phase signals
Channel and C phase signals adjust channel.
Wherein input current (such as three of the current transformer 100 (i.e. T1 either T2 or T3) in Fig. 3 for acquiring motor
A phase currents, B phase currents in phase alternating current or C phase currents) to obtain sample rate current.The input current can be frequency conversion
The output current of device.Since input current is larger, the input current is sampled by current transformer 100, to obtain
The sample rate current of low current signal is taken, in a possible embodiment, the no-load voltage ratio of above-mentioned current transformer 100 is 2000:1.As become
The output unsteady flow of frequency device is 200A, then becomes the low current signal of 0.1A after current transformer.
In a possible embodiment, ranging from 0~600A of above-mentioned output current.In addition, in practical applications, Ke Yigen
According to the different current transformer of the Different matching of capacity motor, which is transformed to the sections ± 0.5A by output current.
It is in parallel with current transformer 100 to adjust capacitance 200 (i.e. C130 either C131 or C132) in Fig. 3, is used for pair
Sample rate current carries out High frequency filter, obtains filtered current signal.When input current is the output current of frequency converter, input electricity
Contain high fdrequency component in stream, the high fdrequency component is filtered by adjusting capacitance 200.It should be noted that the adjustment capacitance 200 may be used also
For carrying out phase shift to sample rate current according to actual needs.
Differential voltage circuit 300 and adjustment capacitance connection, for filtered current signal to be converted to differential voltage signal, from
And it is to realize that bidirectional filtering is prepared.In a possible embodiment, it referring to Fig. 3, is said so that A phase signals adjust channel as an example
Bright, which includes the first differential resistor R122 and the second differential resistor R123；First differential resistor R122's
The first end of first end connection adjustment capacitance C130；The second of the first end connection adjustment capacitance C130 of second differential resistor R123
End；The second end of first differential resistor R122 and the second end of the second differential resistor R123 are grounded.It can be with by foregoing circuit
Filtered current signal is converted into differential voltage signal, the differential voltage signal is from the first end of the first differential resistor R122 and
The first end of two differential resistor R123 exports.
Filter circuit 400 is connect with differential voltage circuit 300, for carrying out bidirectional filtering to differential voltage signal, is obtained
Analog signals.The analog signals can be directly inputted into electricity calculator and carry out electricity calculating.
In a possible embodiment, which includes two stage filter circuit, to effectively filter out in current loop
Noise jamming so that the metering of subsequent current is more acurrate.
In a possible embodiment, referring to Fig. 2, filter circuit 400 includes RLC (RLC resistance-inductance-capacitance) filter circuit
410 and RC (resistance-capacitance) filter circuit 420.
In a possible embodiment, referring to Fig. 3, input terminal and the differential voltage circuit of above-mentioned RLC filter circuits 410 connect
It connects, the output end of RLC filter circuits 410 is connect with the input terminal of RC filter circuits 420, and the output end of RC filter circuits 420 is defeated
Go out above-mentioned analog signals.
Specifically, it is still illustrated so that A phase signals adjust channel as an example, above-mentioned RLC filter circuits 410 include the first filtering
Inductance L101, the first filter resistance R124, the first filter capacitor C104, the second filter inductance L102, the second filter resistance R126
With the second filter capacitor C105.Specifically, the position of the first filter inductance L101 and the first filter resistance R124 can be interchanged, the
The position of two filter inductance L102 and the second filter resistance R126 can be interchanged.
Specifically, the first end of the first filter inductance L101 and the first end of the second filter inductance L102 connect as input terminal
Connect the output end of differential voltage circuit；The second end of the first filter inductance L101 connects the first of the first filter resistance R124
End；The second end of first filter resistance R124 connects the first end of the first filter capacitor C104；The of second filter inductance L102
Two ends connect the first end of the second filter resistance R126；The second end of second filter resistance R126 connects the second filter capacitor C105
First end；The second end of first filter capacitor C104 and the second end of the second filter capacitor C105 are grounded.First filtered electrical
Output end of the first end of the first end and the second filter capacitor C105 of holding C104 as RLC filter circuits 410.
In a possible embodiment, it is still illustrated so that A phase signals adjust channel as an example, above-mentioned RC filter circuits 420 wrap
Include third filter resistance R125, third filter capacitor C106, the 4th filter resistance R127 and the 4th filter capacitor C107.Wherein
The input terminal of the first end of three filter resistance R125 and the first end of the 4th filter resistance R127 as RC filter circuits 420.The
The first end of three filter resistance R125 connects the second end of the first filter resistance R124；The second end of third filter resistance R125 connects
Connect the first end of third filter capacitor C106；The first end of 4th filter resistance R127 connects the second of the second filter resistance R126
End；The second end of third filter capacitor C106 and the second end of the 4th filter capacitor C107 are grounded.Third filter capacitor C106
First end and the 4th filter capacitor C107 output end of the first end as RC filter circuits 420, output analog signals are extremely
Electricity calculator carries out electricity calculating.
In the embodiments of the present invention, the current signal conditioning circuit of the intelligent electric machine on-line checking includes corresponding to
The signal of each phase current signal of three-phase ac signal adjusts channel；Each signal adjustment channel include current transformer,
Adjust capacitance, differential voltage circuit and filter circuit；Wherein current transformer is adopted for acquiring the input current of motor with obtaining
Sample electric current；It is in parallel with current transformer to adjust capacitance, for carrying out High frequency filter to sample rate current, obtains filtered current signal；
Differential voltage circuit and adjustment capacitance connection, for filtered current signal to be converted to differential voltage signal；Filter circuit with it is poor
Voltage division circuit connects, and for carrying out bidirectional filtering to differential voltage signal, obtains analog signals.The utility model embodiment
The technical solution of offer is output to the input current of motor by current transformer acquisition, to the input current sampled with
Sample rate current is obtained, high fdrequency component therein is filtered out by adjusting capacitance, filtered circuit is then changed into differential voltage signal,
To carry out bidirectional filtering, and then the noise jamming in current loop is filtered out, finally obtains analog signals.Therefore, this practicality
New embodiment can directly acquire the input current that frequency converter is output to motor, filtered out high fdrequency component during adjustment and dropped
Low signal interference so that the metering of subsequent current is more acurrate.
In a possible embodiment, each in the current signal conditioning circuit of above-mentioned intelligent electric machine on-line checking referring to Fig. 2
The signal adjustment channel of phase current signal further includes electrostatic discharge protective circuit 500 (i.e. the circuit ESD), the electrostatic discharge protective circuit 500 and
Filter circuit 400 connects.In a possible embodiment, it referring to Fig. 3, is illustrated so that A phase signals adjust channel as an example, the electrostatic
It includes the first diode V107 and the second diode V108 to protect circuit 500.
The first end of the cathode connection third filter capacitor C106 of first diode V107；The anode of first diode V107
Connect the cathode of the second diode V108；The anode of second diode V108 connects the first end of the 4th filter capacitor C107.Ginseng
See the cathode IAP of Fig. 2, the cathode IAN of the first diode V107 and the second diode V108 as the electrostatic discharge protective circuit 500
Output end.
In this way, by electrostatic discharge protective circuit, electrostatic protection, anti-interference can be further carried out so that three finally obtained
Road (corresponds to three signals and adjusts channel) analog signals and more stablizes, is more accurate.
Embodiment two：
Fig. 4 shows that the structure of the current sensing means for the intelligent electric machine on-line checking that the utility model embodiment provides is shown
It is intended to.As shown in figure 4, the current sensing means includes the intelligence electricity in electricity calculator 50, master control borad 60 and such as embodiment one
The current signal conditioning circuit 70 of machine on-line checking.The wherein current signal conditioning circuit 70 and electricity of intelligent electric machine on-line checking
Calculator 50 connects；Electricity calculator 50 is also connect with master control borad 60.
Specifically, the current signal conditioning circuit 70 of the intelligent electric machine on-line checking acquires the input current of motor, carries out
After adjustment processing, analog signals are obtained, which, which is sent to electricity calculator 50, carries out that voltameter is calculated
It calculates as a result, such as frequency of calculating simulation amount signal, power, angle, virtual value, are then sent to master control by electricity result of calculation
Plate 60 carries out breakdown judge by master control borad 60 according to preset threshold value.It, can be to the electricity of motor using above-mentioned current sensing means
Stream is detected, to judge motor whether failure.
The technical solution that the utility model embodiment provides acquires frequency converter by current transformer and is output to the defeated of motor
Enter electric current, which is sampled to obtain sample rate current, filters out high fdrequency component therein by adjusting capacitance, then
Filtered circuit is changed into differential voltage signal, to carry out bidirectional filtering, and then filters out the noise jamming in current loop, most
Analog signals are obtained eventually.Therefore, the utility model embodiment can directly acquire the input current that frequency converter is output to motor,
It has filtered out high fdrequency component during adjustment and has reduced signal interference so that the metering of subsequent current is more acurrate.
The current sensing means that the utility model embodiment provides, the intelligent electric machine on-line checking provided with above-described embodiment
Current signal conditioning circuit technical characteristic having the same reach identical skill so can also solve identical technical problem
Art effect.
It is apparent to those skilled in the art that for convenience and simplicity of description, the electric current of foregoing description
The specific work process of detection device, can refer to aforementioned intelligent motor on-line checking current signal conditioning circuit embodiment in
Corresponding process, details are not described herein.
In addition, in the description of the utility model embodiment unless specifically defined or limited otherwise, term " installation ",
" connected ", " connection " shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or integrally connect
It connects；It can be mechanical connection, can also be electrical connection；It can be directly connected, can also indirectly connected through an intermediary, it can
To be the connection inside two elements.For the ordinary skill in the art, it can understand above-mentioned term with concrete condition
Concrete meaning in the present invention.
It is in the description of the present invention, it should be noted that term "center", "upper", "lower", "left", "right", " perpendicular
Directly ", the orientation or positional relationship of the instructions such as "horizontal", "inner", "outside" is to be based on the orientation or positional relationship shown in the drawings, and is only
The utility model and simplifying describes for ease of description, do not indicate or imply the indicated device or element must have it is specific
Orientation, with specific azimuth configuration and operation, therefore should not be understood as limiting the present invention.In addition, term " the
One ", " second ", " third " are used for description purposes only, and are not understood to indicate or imply relative importance.
Finally it should be noted that：Embodiment described above, only specific embodiment of the present utility model, to illustrate this
The technical solution of utility model, rather than its limitations, the scope of protection of the utility model is not limited thereto, although with reference to aforementioned
The utility model is described in detail in embodiment, it will be understood by those of ordinary skill in the art that：It is any to be familiar with this skill
The technical staff in art field within the technical scope disclosed by the utility model, still can be to the skill recorded in previous embodiment
Art scheme modify or can readily occur in variation or equivalent replacement of some of the technical features；And these modifications,
Variation is replaced, the spirit and model of the utility model embodiment technical solution that it does not separate the essence of the corresponding technical solution
It encloses, should be covered within the scope of the utility model.Therefore, the scope of protection of the utility model is answered described is wanted with right
Subject to the protection domain asked.
Claims (10)
1. a kind of current signal conditioning circuit of intelligent electric machine on-line checking, which is characterized in that including corresponding to three-phase alternating current letter
Number each phase current signal signal adjust channel；Each signal adjustment channel includes current transformer, adjustment electricity
Appearance, differential voltage circuit and filter circuit；
The wherein described current transformer is for acquiring the input current of motor to obtain sample rate current；
The adjustment capacitance is in parallel with the current transformer, for carrying out High frequency filter to the sample rate current, is filtered
Current signal；
The differential voltage circuit and the adjustment capacitance connection, for the filtered current signal to be converted to differential voltage letter
Number；
The filter circuit is connect with the differential voltage circuit, for carrying out bidirectional filtering to the differential voltage signal, is obtained
To analog signals.
2. current signal conditioning circuit according to claim 1, which is characterized in that further include electrostatic discharge protective circuit, it is described
Electrostatic discharge protective circuit is connect with the filter circuit.
3. current signal conditioning circuit according to claim 2, which is characterized in that the differential voltage circuit includes first
Differential resistor and the second differential resistor；
The first end of first differential resistor connects the first end of the adjustment capacitance；The first end of second differential resistor
Connect the second end of the adjustment capacitance；The second end of the second end of first differential resistor and second differential resistor is equal
Ground connection.
4. current signal conditioning circuit according to claim 2, which is characterized in that the filter circuit includes two stage filter
Circuit.
5. current signal conditioning circuit according to claim 2, which is characterized in that the filter circuit includes RLC filtering
Circuit and RC filter circuits；
The input terminal of the RLC filter circuits is connect with the differential voltage circuit, the output end of the RLC filter circuits and institute
The input terminal connection of RC filter circuits is stated, the output end of the RC filter circuits exports the analog signals.
6. current signal conditioning circuit according to claim 5, which is characterized in that the RLC filter circuits include first
Filter inductance, the first filter resistance, the first filter capacitor, the second filter inductance, the second filter resistance and the second filter capacitor；
The first end of first filter inductance connects the difference with the first end of second filter inductance as input terminal
Potential circuit；The second end of first filter inductance connects the first end of first filter resistance；First filtered electrical
The second end of resistance connects the first end of first filter capacitor；Second end connection second filter of second filter inductance
The first end of wave resistance；The second end of second filter resistance connects the first end of second filter capacitor；Described first
The second end of filter capacitor and the second end of second filter capacitor are grounded.
7. current signal conditioning circuit according to claim 6, which is characterized in that the RC filter circuits include third filter
Wave resistance, third filter capacitor, the 4th filter resistance and the 4th filter capacitor；
The first end of the third filter resistance connects the second end of first filter resistance；The of the third filter resistance
Two ends connect the first end of the third filter capacitor；The first end of 4th filter resistance connects second filter resistance
Second end；The second end of the third filter capacitor and the second end of the 4th filter capacitor are grounded.
8. current signal conditioning circuit according to claim 7, which is characterized in that the electrostatic discharge protective circuit includes first
Diode and the second diode；
The cathode of first diode connects the first end of the third filter capacitor；The anode of first diode connects
The cathode of second diode；The anode of second diode connects the first end of the 4th filter capacitor.
9. current signal conditioning circuit according to claim 1, which is characterized in that the no-load voltage ratio of the current transformer is
2000:1。
10. a kind of current sensing means, which is characterized in that including electricity calculator, master control borad and as claim 1 to 9 is any
Current signal conditioning circuit described in；
The current signal conditioning circuit is connect with the electricity calculator；The electricity calculator also connects with the master control borad
It connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820153123.2U CN207817160U (en) | 2018-01-29 | 2018-01-29 | The current signal conditioning circuit and current sensing means of intelligent electric machine on-line checking |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820153123.2U CN207817160U (en) | 2018-01-29 | 2018-01-29 | The current signal conditioning circuit and current sensing means of intelligent electric machine on-line checking |
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| Publication Number | Publication Date |
|---|---|
| CN207817160U true CN207817160U (en) | 2018-09-04 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201820153123.2U Expired - Fee Related CN207817160U (en) | 2018-01-29 | 2018-01-29 | The current signal conditioning circuit and current sensing means of intelligent electric machine on-line checking |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109884382A (en) * | 2019-03-22 | 2019-06-14 | 南京邮电大学 | A kind of current signal detecting device based on FPGA |
| CN110426636A (en) * | 2019-09-09 | 2019-11-08 | 周封 | Intelligent electric machine is electrically connected piece integrated form internet of things sensors |
-
2018
- 2018-01-29 CN CN201820153123.2U patent/CN207817160U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109884382A (en) * | 2019-03-22 | 2019-06-14 | 南京邮电大学 | A kind of current signal detecting device based on FPGA |
| CN110426636A (en) * | 2019-09-09 | 2019-11-08 | 周封 | Intelligent electric machine is electrically connected piece integrated form internet of things sensors |
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